I am just curious, would it be to win the 4 Grand Slams in one calender year? Break Sampras's record of 14 Grand Slam titles? Have the most career wins? longest winning streak on a particular surface? Number of years ,holding the No:1 ranking? Anyway lets just say someone besides Federer or Nadal wins a grandslam in a calender year, decides to retire.....would he become GOAT? I'd like to hear your opinions,thanks!